Remember Poster is due Friday at beginning of period. It is a major grade.

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• Remember Poster is due Friday at beginning of
  period. It is a major grade.
• Today we will do TAKS review over waves
• Pick up note sheet at front
• Book Check today-have it on your desk

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What are the 2 types of energy?
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Types of Energy can be classified as Potential
Energy or Kinetic Energy

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WAVES

• http//www.coe.uh.edu/texasipc/units/waves/wave.mo
  v Intro to Waves Clip

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• WAVES

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• Wave a repeating disturbance or movement that
  transfers energy through space or matter.
• Ex light, sound, radio

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Medium

• any material that a wave transfers energy through
  
• ex. Water is the medium
• for ocean waves
• What is the medium for sound when we talk?

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MECHANICAL WAVES

• Type of wave that require a Medium to travel
  through

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2 Types of Waves (Motion)
Transverse
Compressional (Longitudinal)
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2a. Transverse Waves

• Motion of Molecules

Direction of Wave
Particles of the medium vibrate perpendicular (up
down) to the direction the wave is moving. ex.
Water waves (looks like a rope)/Light
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Transverse Waves
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Animations of Transverse Waves

• http//www.kettering.edu/drussell/Demos/waves-int
  ro/waves-intro.html

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2b. Compressional Waves

• particles vibrate is parallel to the direction of
  the wave. These waves require a medium (such
  as air or water) through which to travel.
• ex. Sound waves (looks like a spring)
• Direction of Movement

Direction of Wave
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Longitudinal Waves
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Longitudinal Waves
Transverse Waves
In water
These two diagrams are waves that are a
combination of transverse and longitudinal.
In a solid
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• Measuring Transverse Waves
• Interactive Website

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3. Wave Properties- Definitions

• Wavelength the distance between one point on a
  wave and the nearest point just like it. The
  greek symbol is ?, called lambda.
• Frequency number of wavelengths (?) that pass a
  given point each second
• Crest the highest point of a transverse wave

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Definitions continued.

• Trough the lowest point on a transverse wave
• Amplitude the measure of the energy of the wave
  (height for TW) ex.
  Large amplitude more energy
• Nodal Line an imaginary line, it is the usual
  resting position of a wave

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V F ? ? V Velocity of the wave (m/s) F
Frequency (hertz) (hz) ? wavelength (m) ?
is the Greek symbol called lambda.
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• You are sitting on a float and the wave bounces
  you up 6 times every two seconds. This describes
  what?
• If the frequency of a wave is 10hz and there is 5
  meters between each compression, the wave speed
  would equal?

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What is the relationship between frequency and
wavelength if speed is constant?

• At a constant speed, there is an inverse
  relationship between frequency and wavelength

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4. Transverse Wave Diagrams

• Draw a transverse wave large enough to label 6
  parts .

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5. Parts of a compressional wave are

• A. A compression is the part where the particles
  of matter are pushed close together.
• B. A rarefaction is the part where particles of
  matter are spread apart.
• C. The wavelength is one complete compression and
  one complete rarefaction. SI unit is in meters.

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Parts of a Longitudinal Wave
Wavelength

• one rarefaction and one compression together.

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Compressional Wave
Compression..Rarefaction
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Animation of Tuning Fork

• http//faraday.physics.utoronto.ca/IYearLab/Intros
  /StandingWaves/Flash/tunefork.html

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Animations of Seismic Waves

• Click here to see how a seismic wave is a
  combination of both transverse and longitudinal
  waves (NOTE Longitudinal and Compression waves
  are the same thing)
• Another animation of both types of waves in
  seismic waves.
• Animations of land during earthquakes. (Half way
  down the page, the three animations next to each
  other)

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What are two differences between sound waves and
light waves?
SOUND WAVES LIGHT WAVES


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What are two differences between sound waves and
light waves?
SOUND WAVES LIGHT WAVES
REQUIRE A MEDIUM TO TRANSFER ENERGY NO MEDIUM REQUIRED CAN TRAVEL THROUGH A VACUUM
COMPRESSIONAL WAVE TRANSVERSE WAVE
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What is the difference between the following
terms?

• Resonance
• Reflection
• Refraction
• Diffraction
• Polarization

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What is the difference between the following
terms?

• Resonance-Vibrating/Singing Wine Glass
• Reflection-Mirror/Echo
• Refraction-Bending due to change in medium
  (Pencil in Water)
• Diffraction-Bending around an opening
• Polarization-Aligning the waves in one direction
  (Sunglasses/Reduces Glare)

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Resonance

• Tacoma Bridge Disaster

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Reflection
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Refraction
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DIFFRACTION
The bending of a wave as it passes an edge or
opening
Ex. Ocean waves change direction and bend after
striking an island Diffraction of a
Monochromatic Light Source
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• Polarizing Filter Demonstration

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Quiz

1. What is a medium?
2. List 3 parts of a Transverse wave.
3. List 2 parts of a Compressional wave.
4. Give an example of a Transverse wave.
5. Give an example of a Compressional (Longitudinal)
   wave
6. Why is there no sound in space?
7. How is your image in the mirror similar to
   hearing an echo?

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Answers

1. A medium is made up of the molecules that
   transfer energy of wave motion.
2. Amplitude, Crest and Trough.
3. Compression and Rarefaction
4. Ocean Waves or Light
5. Sound Waves
6. No matter to transfer energy
7. Both are due to wave reflection